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Strength and thermophysical properties of dense and porous materials based on silicon nitride
https://doi.org/10.17073/1683-4518-2022-3-45-51
Abstract
Dense materials based on Si3N4 with oxide additives activating sintering have been obtained by reaction, liquid-phase sintering and hot pressing, and their physical and mechanical properties have been determined. Porous samples were obtained by semidry forming of Si3N4 + Si workpieces followed by reactive sintering in a nitrogen atmosphere. The porosity was controlled by decreasing the silicon concentration in the initial charge. The thermal conductivity of materials is highly dependent on porosity and decreases with increasing temperature. The thermal conductivity of hot-pressed materials decreases from 60 W/(m·K) at room temperature to 35 W/(m·K) at 1200 °C. The weight gain of porous materials increases from 4·10‒3 kg/m2 with sample porosity of 32 % to 6·10‒3 kg/m2 with 56 % porosity. It is shown that the oxygen impurity is the main reason for the decrease in the thermal conductivity of Si3N4 ceramics.
About the Authors
S. N. PerevislovRussian Federation
I. E. Arlashkin
Russian Federation
O. Yu. Shcherbakova
Russian Federation
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Supplementary files
For citation: Perevislov S.N., Arlashkin I.E., Shcherbakova O.Y. Strength and thermophysical properties of dense and porous materials based on silicon nitride. NOVYE OGNEUPORY (NEW REFRACTORIES). 2022;(3):45-51. https://doi.org/10.17073/1683-4518-2022-3-45-51
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